White Mountains Insurance Group, Ltd
A Bermuda-based holding company that owns and invests in insurance, reinsurance, and related financial businesses, including Ark, a Lloyd's of London insurer, and Bamboo, a homeowners-insurance agency. It began in 1980 as the parent of Fireman's Fund, which was sold to Allianz in 1991; the renamed company took its current name in 1999. The name honors the White Mountains of New Hampshire, near the Vermont and New Hampshire towns where its U.S. operations were based.
Granted 2.5K
Granted 3.4K · Sold 5.0K
Granted 495 · Sold 5.0K
Granted 3.6K
Granted 1.8K
Granted 630 · Bought 1.0K
Granted 2.7K
Granted 450
Granted 450
Granted 500
Granted 450 · Sold 165
Granted 450
Granted 450
Granted 450
Granted 315
Granted 135
Granted 113
| Insider | Stake change | Holds now | Granted / vested | Bought | Sold |
|---|---|---|---|---|---|
| Seelig Robert LawrenceEVP & General Counsel · 7 transactions | — | 20.9K | 2.5K | — | — |
| Rountree George ManningChief Executive Officer, Director · 5 transactions | -16.1% | 19.4K | 3.4K | — | 5.0K |
| Campbell Reid TarltonDirector · 8 transactions | -24.7% | 10.7K | 495 | — | 5.0K |
| Caffrey Liam PChief Executive Officer, Director · 5 transactions | — | 6.1K | 3.6K | — | — |
| Hildreth MichaelaMD & Chief Accounting Officer · 9 transactions | +20.6% | 4.3K | 1.8K | — | — |
| Hicks Weston MDirector · 8 transactions | +124.8% | 2.9K | 630 | 1.0K | — |
| Harrison Giles EPresident · 3 transactions | — | 2.7K | 2.7K | — | — |
| Tanner David AllenDirector · 5 transactions | +12.3% | 2.0K | 450 | — | — |
| Choksi Mary CDirector · 3 transactions | +29.2% | 2.0K | 450 | — | — |
| Papamichael Michael AChief Financial Officer · 2 transactions | — | 2.0K | 500 | — | — |
| Gelston Philip ADirector · 4 transactions | +20.1% | 1.7K | 450 | — | 165 |
| Dillon MargaretDirector · 3 transactions | +71.4% | 1.1K | 450 | — | — |
| Shank Suzanne F.Director · 3 transactions | +80.9% | 1.0K | 450 | — | — |
| Carlson Peter MDirector · 3 transactions | -12% | 852 | 450 | — | — |
| Yi StevenDirector · 2 transactions | +1650% | 525as of May 2025 | 315 | — | — |
| Chu JohnDirector · 1 transaction | — | 200 | 135 | — | — |
| Klar StephenDirector · 1 transaction | — | 0 | 113 | — | — |
Select a row to see that insider’s individual transactions. Sum of the holdings confirmed in the 12 months before this insider's last filing. A Form 4 reports a holding per line — held directly, or through a named trust, partnership or foundation, and in each share class separately — never a person’s total. Lines not restated in that time are left out and shown apart: an active filer restates what they still hold, so a line they did not restate is more often an entity since renamed, whose shares a successor line reports too. An amber marker means some were left out.
Net open-market activity over the last 3 years: -9.2K shares. Grants, option exercises and tax withholding are excluded — they are compensation mechanics, not decisions to buy or sell.